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Finding the Fourth Proportional to 371.36, 512.72 and 309.28

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Solution

The fourth proportional to 371.36, 512.72 and 309.28 is: 427.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.36 : 512.72 = 309.28 : x
  2. Step 2: Convert to fraction form
    371.36/512.72 = 309.28/x
  3. Step 3: Cross multiply
    371.36x = 512.72 × 309.28
  4. Step 4: Simplify right side
    371.36x = 158,574.04
  5. Step 5: Solve for x
    x = 158,574.04/371.36
  6. Step 6: Final answer
    x = 427.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.